21222020111211 has 6 divisors (see below), whose sum is σ = 30654029049540. Its totient is φ = 14148013407468.

The previous prime is 21222020111191. The next prime is 21222020111287. The reversal of 21222020111211 is 11211102022212.

21222020111211 is a `hidden beast` number, since 21 + 2 + 220 + 201 + 11 + 211 = 666.

It is not a de Polignac number, because 21222020111211 - 2¹⁸ = 21222019849067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222020111291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179001117281 + ... + 1179001117298.

It is an arithmetic number, because the mean of its divisors is an integer number (5109004841590).

Almost surely, 2^{21222020111211} is an apocalyptic number.

21222020111211 is a deficient number, since it is larger than the sum of its proper divisors (9432008938329).

21222020111211 is a wasteful number, since it uses less digits than its factorization.

21222020111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358002234585 (or 2358002234582 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21222020111211 its reverse (11211102022212), we get a palindrome (32433122133423).

The spelling of 21222020111211 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, one hundred eleven thousand, two hundred eleven".